Improvement in devices for converting motion



H. E.MARCHAND.

Devices for Converting Motion. `N0.1146,925.

Patented ian. 27,1974.

Uivrriin STATES PATENT @Prion HENRY MARCHAND, OF PITTSBURG,PENNSYLVANIA.

IMPROVEMENT IN DEVICES FOR CONVERTING MOTION.

Speciicazion forming part of Letters Patent No. 146,925, dated January27,1874; application filed January 14, 1874.

To all whom it may concern:

Be it known that I, HENRY E. MARCHAND,

of Pittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented certain inner walls of the saine, and the movement of saidframe is in a regular direct line, all jars or concussions Abeingentirely avoided.

In the drawings, Figure l is a perspective view of a mechanical movementconstructed according to my invention, and Fig. 2 is a longitudinalvertical section thereof.

In devices heretofore known in which an eccentric is employed to convertrotary into reciprocating motion the movement of the ecy centric istransmitted by a closely-fittin g yoke toa jointed connecting-rod, thethrow of which very` apt to be irregular or unsteady. In order-t `noidthese defects, and to obtain from an eccentric a truc rectilinearreciprocating inotionwhich is regular and in a direct'line, whether themechanism be arranged in a horizontal, vertical, or other position, Ipropose to employ mechanism of the description hereinafter explained.

The shaft A, represented in the drawing as carrying the eccentric B, isconnectedwith a suitable prime motor for imparting a rotary niotion tothe saine. The eccentric is constructed in two sections or halves, thecontiguous faces of which are provided withA dovetail tongues andgrooves a b, in order that they may be interlocked together. Thisconstrue tion of eccentric is resorted to with shafts running in boxesat their ends, so as to enable the Y eccentric to be applied in positionwithout removing said shaft from its bearings. Suitable fasteningdevices, suoli as screws inserted at the `junction ofthe sections of theeccentric, may be employed for obviating any lateral movement of thesame; but, as a general rule, no suoli result occurs when a slotted yokeor frame, C, is employed in connection with the eccentric, as proposedby me.4 Said yoke or frame is designed to receive a rectilinearreciprocating motion in reverse directions from the eccentric, thelatter being for this purpose located or arranged within said yoke orframe in such a manner that during the rotation of the shaft A it willbear on or come in contact with the opposite ends of the frame foraccomplishing the result mentioned. The frame or yoke C is composed oftwo slotted side bars, D, provided with a closed or solid end, E, andwith a detachable block, F, at its opposite end, a powertransmittingstem or rod, G, being formed with or connected to the front end of theframe. The frame is provided with lslotted sides, so as to enable therotary shaft to pass through the same in such a manner as not to come incontact with the ends of the frame during the movement. The sectionaleccentric arranged within the frame C bears first against one end wallof the frame as it is descending, and gradually rides or glides over thesaine, and then, when it rises to finish its revolution, it bears on theopposite end wall of the frame, thus imparting a perfect, smooth,uniform, and true movement to the frame and its stein or rod. The blockF, which closes the rear of the frame C, is provided with a verticalopening or channel, H, and with a lower horizontal passage, I,communicating with the same, for the purpose of supplyinglubricating-oil to the eccentric and the adjacent parts. An oil-cup ofany approved fashion may, for this purpose, be attached to the block F,for insuring a regular supply of oil.

A mechanical movement of the nature described is regular and precise inits action, and thus it is eminently adapted for operating air and otherpumps, steam-engine valves, sewing-machine mechanism, and machinery ofevery description which requires a reciproca-ting motion.

The eccentric frame is guided in its movement, and supported in a truehorizontal, vertical, or other position, by causing the upper portion ofthe side bars ofthe same to rotate with the axis of the eccentric, orslide or glide over the same, and as said shaft or aXis revolves orturns, but little friction occurs, either between the shaft and the yokeor the eccentric and the yoke.

In certain instances where the mechanism described by me, or. itslsubstantial equivalent, is employed in connection with running-gear tor movable machinery, such as railroad-cars, I propose to attach thepower-transmitting stem to its frame, or to a stem connected With theyoke, by a hinged connection or universal joint, so as to permit thesame to conform to the motion of the cars When turning curves, or whenexposed to lateral jars.

I claim as my invention@ The combination of the sectional eccentric Band its shaft embraced by the yoke C, the end Walls of the yoke beingbrought in bearing contact with the periphery of the eccentric forimparting a rectilinear reciprocating motion to the yoke and its stem.

In testimony that I claim the foregoing l have hereunto set my'hand this14th day of January, 1874.

HENRY E. MARCHAND.

VVtnesses:

J AMES L. Nonms, ALBERT H. Noimrs.

